As for music, admittedly, I don't listen to a lot of vtuber music. There are some I do like, but I don't usually spend time listening, unless it's from certain ones or instrumentals. But, to contribute towards that, here's a few that haven't been posted that I like:
At the timestamp, Lumi sings Someone Like You by Adele. I liked Lumi's singing before this, but I'll be honest, about a minute into her singing this, I stopped whatever game I was playing at the time to give it my full attention. I was blown away at how good she is. I honestly think this is some of her best singing, and I still go back to this stream to listen to it. Her whole karaoke set was great too.
At OffKai, Lumi did some karaoke at the party room thing Phase did, and she karaoke'd Through the Fire and Flames, and it was pretty great. You can tell she was having a lot of fun with this one.